These clips have a very strong high-frequency impulsive peak, at the frequency specified for every sample, and there is a lowpassed clip for each one with just that frequencies an above removed. All clips are resampled versions of the same clip, (where the strong peak is originally at 16300 KHz) , so that for every sample the peak is at a different frequency.

In order to know if you can hear the strong impulsive peak for every sample, you must be able to ABX the test sample against the lowpassed version of it. ABX is required in order to have meaningful results.

I have available just the clips shown here because I have no more space in my web page.

The 12 KHz clip should be easily ABXable for nearly anyone, specially if they are not very old. On casual listening (without concentrating) and using good soundcard & headphones (Audiophile 2496, Sennheiser HD 580) I can hear a difference on the lowpassed 17.5 KHz clip. Concentrating I could ABX the 18 KHz file, with results of 12/14 (p=0.6 %).

This should be a more realistic test of how high can people hear in extreme cases of somewhat 'real' music.